radiation

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radiation

76 links

Antennas : 15M
  • The extended double zepp - This wire antenna exhibits extraordinarily high gain in a bi directional radiation pattern.
    [ Hits: 12405 | Votes: 28 | Rating: 8.11 ]
  • 21 mhz half wave GP Antenna - 21 mhz half wave ant -very low radiation angle - full size and light weight- all coax matching system - decoupling care to prevent low angle radiation degrade
    [ Hits: 3102 | Votes: 6 | Rating: 2.17 ]
Antennas : 20M
  • 20m delta loop  pop - This antenna is fed for vertical polarisation, to give a low angle of radiation for DX and also a nearly omni-directional radiation pattern.
    [ Hits: 65707 | Votes: 69 | Rating: 6.71 ]
Antennas : 80M
  • 80M Vertical antenna with capacitance hat - Simple wire antenna cheap to make, using readily available materials, Low angle radiation, with rejection of high angle signals Wide bandwidth, with resonance at the 80M DX window (3.790-3.800 MHz); and Maximum height is 40 feet
    [ Hits: 25084 | Votes: 23 | Rating: 7.05 ]
Antennas : Array
  • Building an own Stackmatch - Nowdays lots of people are putting up antennas to either beam in different directions at the same time or just to stack them and get a lower angle of radiation. Use this stackmatch to match you array.
    [ Hits: 1619 | Votes: 1 | Rating: 8 ]
Antennas : EH
  • W8JI Technical pages - Amplifier, vacuum tube, receiving beverage loop vertical and transmitting antenna system technical information radiation resistance, EH antenna, noise,receivers, and information on keyclicks.
    [ Hits: 22138 | Votes: 37 | Rating: 8.3 ]
Antennas : Feed Lines
  • Detuning Towers - The goal of detuning is not to avoid resonance, but rather to minimize re-radiation and/or current in the interfering structure.
    [ Hits: 815 | Votes: 1 | Rating: 10 ]
Antennas : G5RV
  • G5RV All-Band HF Antenna  pop - About G5RV antennas, with radiation pattern produced with eznec
    [ Hits: 29619 | Votes: 13 | Rating: 4.54 ]
Antennas : Quad
  • Cubic Quad  pop - The cubic quad is a very popular way to get reasonably high gain and excellent front to back ratios as well as low angles of radiation for without going to extreme heights. Includes design for 2 6 10 12 15 meter bands
    [ Hits: 68047 | Votes: 64 | Rating: 5.08 ]
Antennas : Rhombic Antennas : Theory
  • Small antennas and radiation resistance - Small antenna, what causes loss and how to increase radiation resistance in small antennas., A description of loss and radiation resistance.
    [ Hits: 883 | Votes: 0 | Rating: 0 ]
  • Antenna Height Theory - Antenna mounting height, the higher the better? Learn how radiation pattern change, and decide if you need an higher or a lower angle for your dx needs.
    [ Hits: 1877 | Votes: 5 | Rating: 7.2 ]
  • Radiation and fields - Electric Fields, magnetic fields, electromagnetic fields, losses, fresnel zone, nearfield and farfield
    [ Hits: 446 | Votes: 1 | Rating: 10 ]
Antennas : VHF UHF
  • DK7ZB 144 mhz Yagis - High gain, good pattern and acceptable bandwidth. These aims can be realized with a radiation-resistance of 25-35Ohms, because the 28-Ohm-feedpoint is very simple to match.
    [ Hits: 1908 | Votes: 7 | Rating: 6.86 ]
Operating Modes : Amateur Radio Astronomy
  • 408 MHz Survey - Survey of galactic synchrotron radiation at 408 MHz in the south of England using a 10 metre dish and a Dicke radiometer
    [ Hits: 2776 | Votes: 2 | Rating: 8.5 ]
Operating Modes : VHF UHF Radio Scanning : Weather
  • NovaLynx Corporation - "Instruments & Systems for Weather & Water Monitoring; weather stations, wind alarms, sensors for wind speed, wind direction, precipitation, temperature, relative humidity, barometric pressure, solar radiation, evaporation, rain & snow gauges, lightning detection."
    [ Hits: 669 | Votes: 3 | Rating: 10 ]
Software : Antenna analysis
  • Yagi Designer - Program that produces antenna radiation patterns and graphs for SWR, forward gain, and F/B ratios
    [ Hits: 22763 | Votes: 63 | Rating: 6.38 ]
  • 4NEC2 antenna modeler  pop - 4nec2 is a completely free Nec2, Nec4 and windows based tool for creating, viewing, optimizing and checking 2D and 3D style antenna geometry structures and generate, display and/or compare near/far-field radiation patterns for both the starting and experienced antenna modeler. Can be interfaced to HFwin32 propagation prediction software.
    [ Hits: 30094 | Votes: 131 | Rating: 7.32 ]
Technical Reference : Electronics

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